Comunication between 12F683 & 16F84A with serin2/serout2

[kklim29]

I'm working on a project which need to send data from 12F683 to 16F84A. I'm using a 4MHz crystal on 84A & configure 683 to use internal 4MHz clock. I can see 12F683 is sending data out with a scope but 16F84A is not responding (data no showing in 16X2 LCD). It work when I replace 12F683 with 16F84A.

12F683 code:
SEROUT2 GPIO.5,813 ["A", tmp]

16F84A code:
serin2 PORT5.4,813,[WAIT("A"),dec CONT2]

Anyone know what's the problem? Thanks.

[mackrackit]

serin2 PORT5.4,813,[WAIT("A"),dec CONT2]

PORT5 ???

Typo??

But you may also want to check to see if the ADC is turned off for the pins you are using.

[kklim29]

PORT5 ???

Typo??

But you may also want to check to see if the ADC is turned off for the pins you are using.

Sorry, should be PORTB.5 for the 16F84A.

I'm using the ADC to measure the analog signal on GPIO.0,1,2 &4, GPIO.5 is digital. So I can send the result to 16F84A to display on a LCD.

[mackrackit]

Hmm..
Can you post the whole code(s) and actual configs?
Must be something else the problem other than the lines shown.

[kklim29]

Here is the code use for 12F683

   include "modedefs.bas"

   DEFINE    ADC_BITS 10          ' Set number of bits in result
   DEFINE    ADC_CLOCK 3       ' Set clock source (3=rc)
   DEFINE    ADC_SAMPLEUS 50 ' Set sampling time in uS
   
    ANSEL   = %00111111   ' Set all to A/D, A/D clock = Frc
    TRISIO  = %0011111    ' GP.5 = serial out, rest inputs
    OSCCON  = %01100000 ' Internal 4MHz osc
    
    
    tmp     var byte
    RESULT  VAR word[8]  ' 8-BYTE ARRAY STORAGE FOR 4 A/D CONVERSIONS
    J       VAR BYTE        ' A/D CHANNEL NUMBER BYTE VARIABLE
    resul   var byte
    datain  var GPIO.5
    b       var byte
    
tmp = 0
       
MAIN:
    pause 1000        'Wait for 16F84A send data to LCD
    tmp = tmp + 1
    if tmp > 9 then tmp = 0
    for b = 1 to 4
    serout2 datain,813,["B",dec tmp]
    next b
    goto MAIN

and code for 16F84A:

include "modedefs.bas"

rly        VAR PORTB.7    'relay
voltrelay  var PORTB.6    'Relay Voltage control
datain     var PORTB.5    'Read serial data from adc
sw1           VAR PORTB.0
sw2           VAR PORTB.1
cont2      VAR byte
'RESULT     VAR word
typ           VAR BYTE
b           VAR BYTE       'If.. Then..

TRISA = %00000000
TRISB = %00000111

rly = 0
voltrelay = 0
b = 0
typ = 0


vslt:    lcdout $fe, 1
        pause 50
        lcdout "1.Relay Voltage"
    serin2 datain,813,[WAIT("B"),cont2]
        lcdout $fe, $c0, "2.Enter", #cont2
    goto vslt

[mackrackit]

Two things I see after a quick look...
You need to tell PBP what the OSC speed is. To do this add the following to the top portion of your code(s)

DEFINE OSC 4

And double check the ANSEL settings.
I think you have GPIO.5 set for analog. Should be

ANSEL   = %000011111

BTW. I added code tags for you. Makes it much easier to read on the forum.

[kklim29]

Still not working. I also try set all the port to digital (ANSEL = %00000000) still not showing anything on LCD. Hardware connection checked. Do you think is a hardware issue?

[Acetronics2]

Hi, Kklim

could you " twist" somewhat the OSCTUNE register of the 683 ??? ... just to get a precise match with the '84 oscillator frequency ...

may be just use the " blinky led " program and trim the 683 osc frequency to that you've measured on the '84 ...

internal osc is " not so good " if you need frequ. matching ...

Alain

[Bruce]

Try changing serout2 datain,813,["B",dec tmp] to serout2 datain,813,["B", tmp]

[kklim29]

Hi all,
I capture 2 waveform with a scope from 84A to 84A which work fine and 683 to 84A (no data) and Alain is correct, 683 waveform is shorter (Faster) then the 84A, after playing with the OSCTUNE, every 10 data send, only 1 data is show on the LCD. Also try change the Baud Rate from 813 to 1646 & 188, no data show.

Looks like device with internal clock is no good for sending data to a device with external clock

[Acetronics2]

Hi all,
I capture 2 waveform with a scope from 84A to 84A which work fine and 683 to 84A (no data) and Alain is correct, 683 waveform is shorter (Faster) then the 84A, after playing with the OSCTUNE, every 10 data send, only 1 data is show on the LCD. Also try change the Baud Rate from 813 to 1646 & 188, no data show.

Looks like device with internal clock is no good for sending data to a device with external clock

So, I'm afraid you have to turn to a 16F88 or equ. 14 pins device ... ( 16F684? )

Alain